SU0007408 - Laserfiche WebLink

Home Browse Search

Northern Expressway Environmental Report Table 15.1 Approximate generated vibration levels for various sources Activity Typical levels of ground vibration Vibratory rollers Up to 1.5 mmis at distances of 25 m Higher levels could occur at closer distances;however,no damage would be expected for any building at distances greater than approximately 12 m(for a medium to heavy roller) Hydraulic rock breakers 4.50 mmis at 5 m (levels typical of a large rods 1.30 mmis at 10 m breaker operating in hard 0.4 mmis at 20 m 0.10 mmis at 50 m sandstone) mis t distances of approximately 5 m,2 mmis at distances of 15 m.At Compactor 20 m a apP cty distances9 reater than 30 m,vibration is usually below 0.3 mmis Pile drivingfremoval 1 to 3 mmis at distances of 25 m to 50 m depending on soil conditions and the energy of the pile driving hammer These levels are well below the threshold of any possibility of damage to structures in the vicinity of these works.At closer distances to the piling operations,some compaction of loose fill would occur due to vibratory effects Bulldozers 1 to 2 mmis at distances of approximately 5 m.At distances greater than 20 m,vibration is usually below 0:2 mmis Air track drill 4 to 5 mmis at a distance of approximately 5 m,and 1.5 mmis at 10 m.At distances greater than 25 m,vibration is usually below 0.6 mmis,and at 50 m or more,vibration Is usually below 0.1 mmis Truck traffic(over normal(smooth) 0.01 to 0.2 mmis at the footings of buildings located 10 to 20 in from a road surfaces) — roadway Truck traffic 0.1 to 2.0 mmis at the footings of buildings located 10 m to 20 m from a (over irregular surfaces) roadway 15.3 Effects of vibration 15.3.1 Categories of ground vibration As identified above,the effects of ground vibration are classified into three categories being human exposure,building contents and building structures. In general,vibration criteria for human disturbance are more stringent than vibration criteria for effects on building contents and building structural damage.Hence,compliance with the more stringent limits dictated for human exposure,would ensure that compliance is also achieved for the other two categories. Human exposure Table 15.2 gives an indication of typical human perception of vibration. 15-2